The air in the cramped apartment is thick with unspoken longing. The brother, half-naked and sweaty from his workout, catches his sister's gaze lingering on his crotch. She quickly looks away, but not before he sees the hunger in her eyes. '¿Qué quieres, hermana?' he asks, his voice low and challenging. She bites her lip, her eyes darting back to his cock. 'Te quiero a ti,' she admits, her voice barely a whisper. He steps closer, his body inches from hers, ready to explore the depths of their shared desire.